CVE-2021-41590Network attack vector

Internal port discovery via SMTP configuration test

Published Oct 27, 2021 · Updated Aug 4, 2024

SSRF in Gradle Enterprise 2020.4 through 2021.2 allows remote authenticated users to probe internal TCP ports via an SMTP test. The administrator-only installation interface submits configured host and port values to its SMTP connection test and reveals whether each TCP port accepts a connection. Administrative access to that interface is required, and the result discloses reachability within the server-side network without reading service contents.

CVSS severity5.3
Medium
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Gradle Enterprise 2020.4 through 2021.2 allows remote authenticated users to probe internal TCP ports via an SMTP test. The administrator-only installation interface submits configured host and port values to its SMTP connection test and reveals whether each TCP port accepts a connection. Administrative access to that interface is required, and the result discloses reachability within the server-side network without reading service contents.

The record

CVE
CVE-2021-41590
Published
Oct 27, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1046
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Oct 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1046Network Service Discovery

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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